i see that alot of people in the state wont sell or trade to other countries
other than the time it will take to ship
i dont see why so many people do this
i suggest you just have them pay for shipping
and get the shipping $ from them first
but maybe their is a bigger problem that i dont know about

Greater chance of being lost, if it gets held up in customs you might have to pay even more to get it to you, it may end up costing more than the yoyo is worth to actually ship it. Mainly its just easier to get lost or damaged